將兩個表分為一組，共有時間戳和每個月的總金額

Question

第1次收入和第2次支出，以日期作為時間戳記，以及每個月的收入和支出總額，現在我想將其放入下表中

Month | Income | Expense | Profit

到現在為止，我只能將一個表的總數作為總數進行分組，但是我需要一個可以同時處理兩個表的查詢。

我的查詢是

$result = mysql_query("SELECT 
    date_on,
    MONTHNAME(FROM_UNIXTIME(date_on)) as expmonth,
    YEAR(FROM_UNIXTIME(date_on)) as expyear,
    sum(amount) as exp_total

    from finance_grdps_exp

    group by  expmonth,expyear order by date_on DESC")

    or die(mysql_error());  
    $no=0;   
    $countem = 0;
    while($row = mysql_fetch_array($result))
        {$no++;
            echo' 
            <tr class="gradeX">
                <td>'.
                $row['expmonth'].' '.$row['expyear'].'
                </td>
                <td>'.
                $row['exp_total'].'
                </td>
                <td>'.
                $row['income_total'].' /* not working as if now
                </td>
                <td>'.
                PROFIT.'/* not working as if now
                </td>
                </tr> 
                ';
                }

---

伙計樣本日期基准為....

收入表...

名稱| 收入日期（時間戳）| 收入金額

經驗表

名稱|日期（時間戳）|金額

謝謝

魯本感謝您的回復....但我遇到了錯誤

...在這兩種情況下我都出錯了---每個派生表都必須具有自己的別名....

SELECT MONTHNAME(FROM_UNIXTIME(date_on)) as expmonth,
       YEAR(FROM_UNIXTIME(date_on)) as expyear,
       SUM(amount) as exp_total, 
       SUM(income_amount) as inc_total 
FROM(SELECT finance_grdps_exp.date_on AS date_on, 
            finance_grdps_exp.amount AS exp_amount, 
            0 AS inc_amount 
     UNION 
     SELECT finance_grdps_income.income_date AS date_on, 
            0 AS exp_amount, 
            finance_grdps_income.income_amount AS inc_amount) 
GROUP BY expyear, expmonth ORDER BY date_on DESC 

請幫忙

Answer 1

假設您有兩個具有以下結構的表finance_grdps_exp和finance_grdps_inc：

date_on | amount

1. 如果在一個表中沒有用date_on編碼的具有相同年份和月份的兩行，則date_on僅包含年份和月份，即所有行的其他字段（日期和時間）相同。

   您可以將它們與INNER JOIN構造結合使用：

    SELECT finance_grdps_exp.date_on AS date_on, finance_grdps_exp.amount AS exp_amount, finance_grdps_inc.amount AS inc_amount FROM finance_grdps_exp INNER JOIN finance_grdps_inc ON finance_grdps_exp.date_on = finance_grdps_inc.date_on 

   結果結構為：

     date_on |  exp_amount |  inc_amount 

   然后，將您的想法應用於結果結構：

    SELECT date_on, MONTHNAME(FROM_UNIXTIME(finance_grdps_exp_and_inc.date_on)) as expmonth, YEAR(FROM_UNIXTIME(finance_grdps_exp_and_inc.date_on)) as expyear, SUM(finance_grdps_exp_and_inc.exp_amount) as exp_total, SUM(finance_grdps_exp_and_inc.inc_amount) as inc_total FROM (SELECT finance_grdps_exp.date_on AS date_on, finance_grdps_exp.amount AS exp_amount, finance_grdps_inc.amount AS inc_amount FROM finance_grdps_exp INNER JOIN finance_grdps_inc ON finance_grdps_exp.date_on = finance_grdps_inc.date_on) AS finance_grdps_exp_and_inc GROUP BY expyear, expmonth ORDER BY date_on DESC 

   mysql_query給我們：

     [ expmonth, expyear, exp_total /* expense per month */, inc_total /* income per month */ ] 

   為了確保INNER JOIN語句的最大性能，請在兩個表中為date_on字段創建索引。

2. 其他情況（使用UNION SELECT）。

    SELECT MONTHNAME(FROM_UNIXTIME(finance_grdps_exp_and_inc.date_on)) as expmonth, YEAR(FROM_UNIXTIME(finance_grdps_exp_and_inc.date_on)) as expyear, SUM(finance_grdps_exp_and_inc.exp_amount) as exp_total, SUM(finance_grdps_exp_and_inc.inc_amount) as inc_total FROM(SELECT finance_grdps_exp.date_on AS date_on, finance_grdps_exp.amount AS exp_amount, 0 AS inc_amount FROM finance_grdps_exp UNION SELECT finance_grdps_inc.date_on AS date_on, 0 AS exp_amount, finance_grdps_inc.amount AS inc_amount finance_grdps_inc) AS finance_grdps_exp_and_inc GROUP BY expyear, expmonth ORDER BY date_on DESC